Browser Extension Mailvelope

Mailvelope has teamed up with GMX to make encrypted communication more accessible.

During setup, you will be asked to install the mailvelope browser extension. Mailvelope specialized in end-to-end encryption and has partnered with GMX to ensure the integrity of encrypted communication. GMX guarantees that the software is trustworthy. Mailvelope will carry out any tasks that need to take place locally on your device (as opposed to on a GMX server) including:

  • Key generation
  • Storing and managing keys
  • Encrypting keys with your passphrase
  • Encrypting outgoing email
  • Encrypting incoming email
  • Creation and encryption of your recovery files

Why? True end-to-end encryption only works, if the process actually takes place on your computer and not inside of the infrastructure of GMX.

The mailvelope-websites have a characteristic background made up of different shapes and icons, which you can customize in the mailvelope settings. In the rare event of coming across a fake mailvelope website, this feature can help you identify and distinguish the fake website from the real one. Visit for a more detailed documentation.

Experts only: Verify and build mailvelope yourself

Mailvelope is a free open source software, i.e. you can access its source code at any time (among other freedoms). The code base is available on Github.

The binaries provided by GMX are signed and can be checked for integrity by any PGP tool. Please find our code signing key at Its fingerprint is 16F4 5CCC 1848 12B4 AC93 0EF3 60DD 1F16 B339 0CD1​.

Confused? You don't need to understand this section to use mailvelope. The point is that any software developer can verify whether mailvelope works as described and doesn't include backdoors or other entry points.

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